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Spirulina platensis‐ capped mesoporous magnetic nanoparticles for the adsorptive removal of chromium
Author(s) -
Mohan Sreelakshmi,
Govindankutty Gopika,
Sathish Asha,
Kamaraj Nithya
Publication year - 2021
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23854
Subject(s) - spirulina (dietary supplement) , chromium , nanoparticle , mesoporous material , magnetic nanoparticles , chemistry , chemical engineering , nuclear chemistry , materials science , nanotechnology , catalysis , organic chemistry , raw material , engineering
The magnetic nanoparticles prepared through the co‐precipitation method were surface modified using Spirulina platensis . The mesoporous and superparamagnetic nature of the adsorbent was confirmed by Brunauer‐Emmett‐Teller (BET) and vibrating sample magnetometer (VSM) analyses, respectively. Further, an increased specific surface area of 75.3 m 2 /g was reported in the BET studies. Parameters such as pH, contact time, concentration, and temperature were studied to optimize the operating conditions influencing adsorption. Thermodynamic studies justified the spontaneity and endothermic nature of adsorption. The adsorbent exhibited a better performance at 1.5 pH and 120 minutes of contact time. The monolayer adsorption capacity of the material was found to be 29.23 mg/g from the evaluation of Langmuir adsorption isotherm. The second‐ order kinetic studies suggest the predominance of chemisorption. Further, the X‐ray photoelectron spectroscopy (XPS) studies confirmed that the adsorption mechanism is electrostatic attraction accompanied by reduction. Notably, a regeneration efficiency of 75.26% was achieved with NaOH as the desorbing agent.